From: Michal Hocko <mhocko@suse.com>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: zangchunxin@bytedance.com, Johannes Weiner <hannes@cmpxchg.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tejun Heo <tj@kernel.org>,
lizefan@huawei.com, Jonathan Corbet <corbet@lwn.net>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
kafai@fb.com, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
andriin@fb.com, john.fastabend@gmail.com, kpsingh@chromium.org,
Cgroups <cgroups@vger.kernel.org>,
linux-doc@vger.kernel.org, Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
bpf@vger.kernel.org
Subject: Re: [PATCH] mm/memcontrol: Add the drop_cache interface for cgroup v2
Date: Tue, 22 Sep 2020 12:01:52 +0200 [thread overview]
Message-ID: <20200922100152.GW12990@dhcp22.suse.cz> (raw)
In-Reply-To: <CALOAHbCvRA61NbamdKSxLoy4eNqR6G_1OA=zEjb7Mu0Yh9O0sg@mail.gmail.com>
On Tue 22-09-20 16:06:31, Yafang Shao wrote:
> On Tue, Sep 22, 2020 at 3:27 PM Michal Hocko <mhocko@suse.com> wrote:
[...]
> > What is the latency triggered by the memory reclaim? It should be mostly
> > a clean page cache right as drop_caches only drops clean pages. Or is
> > this more about [id]cache? Do you have any profiles where is the time
> > spent?
> >
>
> Yes, we have analyzed the issues in the direct reclaim, but that is
> not the point.
Are those fixed?
> The point is that each case may take us several days to analyze, while
> the user can't wait, so they will use drop_caches to workaround it
> until we find the solution.
As I've said there are several options to achieve an immediate action.
Careful resource domains configuration will certainly help with that.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-09-22 10:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-21 8:02 zangchunxin
2020-09-21 8:12 ` Michal Hocko
2020-09-21 10:42 ` Chris Down
2020-09-21 10:55 ` Yafang Shao
2020-09-21 11:05 ` Michal Hocko
2020-09-21 11:23 ` Yafang Shao
2020-09-21 11:36 ` Michal Hocko
2020-09-22 4:20 ` Yafang Shao
2020-09-22 7:27 ` Michal Hocko
2020-09-22 8:06 ` Yafang Shao
2020-09-22 10:01 ` Michal Hocko [this message]
2020-09-22 9:43 ` [External] " Chunxin Zang
2020-09-22 9:51 ` Chris Down
2020-09-22 10:24 ` Chunxin Zang
2020-09-22 10:42 ` Chris Down
2020-09-22 12:37 ` Chunxin Zang
2020-09-22 12:43 ` Chris Down
2020-09-23 2:35 ` Chunxin Zang
2020-09-22 19:57 ` Shakeel Butt
2020-09-23 2:40 ` Chunxin Zang
2020-09-21 15:55 ` Shakeel Butt
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